The blast panicked other students and faculty of the higher secondary school in Dijkot area as they struggled to take refuge, thinking it was a terrorist attack.
Educational institutions are on alert following a January 20 terrorist attack on Bacha Khan University in Charsadda district of Khyber Pakhtunkhwa, which left 22 people dead.
Five students behind cracker attack outside school
Police have arrested 16-year-old Muhammad Azeem, a student of the school, spokesperson of the law enforcement agency said.
According to the SHO, facts were being ascertained to decide a future course of action against the student.
Back-to-back blasts take law enforcers by surprise
Confirming the incident, Principal Muhammad Tufail told The Express Tribune the student had been reprimanded for his act, which did not appear to have a terror-related motive.
In a similar incident in Karachi on February 12, five students were found to have been involved in a cracker attack outside a school in North Nazimabad area.
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